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Resistive RAM (ReRAM) is an attractive candidate for next generation embedded nonvolatile memory [1][2], with several advantages compared to conventional flash technology. First, ReRAM is a CMOS-compatible low temperature back-end of line (BEOL) memory. There is almost no mutual impact between ReRAM element and front-end CMOS devices during the wafer processing. Second, it only needs 2∼4 extra masks,...
This work presents a novel stretchable pH sensing patch to detect the pH in body fluid which is one of the most important parameters in human health monitoring. The sensing patch is a hybrid package comprising of polyimide/gold-based stretchable interconnects and graphite composite-based flexible pH sensor. With the integration of stretchable interconnects, the patch is able to withstand external...
This paper presents a new approach for broken rotor bars detection in induction motors. When broken rotor bar occurs, the rotor resistance will increase. Furthermore, thermal effects of rotor resistance are considered to address practical aspects. Therefore, a suitable method to detect broken rotor bar is rotor resistance estimation. An applicable method in state estimation is Cubature Kalman Filter...
Tracing current vs. voltage curve is an important part of the documentation of a Photovoltaic (PV) system to comply to the IEC 62446 standard. In order to get the high accuracy, the PV array would be subjected to an unspecified and large number of voltage perturbations often using specialized measuring instruments. In this paper, we explain how to minimize the tracing-time by performing a pre-defined...
A health monitoring method using the saturationregion resistance is proposed in this paper to identify the level of aging associated with power semiconductor switches inside a Boost converter. Power MOSFETs are one of the most age-affected components in power electronic converters, and the on-resistance has been proved to be the most significant aging factor in power MOSFETs. However, the small value...
Interior permanent magnet synchronous machine drives are widely employed in electric traction systems and various industrial processes. However, prolonged exposure to high temperatures while operating can demagnetize the permanent magnets to the point of irreversible demagnetization. In addition, direct measurements with infrared sensors or contact-types sensors with wireless communication can be...
This paper proposes an enhanced approach to estimate the stator winding temperature based on active DC flux injection for induction machines with two representative direct torque control (DTC) schemes, the conventional hysteresis-based DTC and the deadbeat DTC. In this method, the stator resistance is regarded as the indicator of its temperature, and is estimated by applying offsets to the flux controllers...
In the biomedical sector, pressure sensors exhibit an important role towards monitoring and recognition of sitting posture for wheelchair users, which is helpful for pressure ulcer prevention and cure. In this paper, a flexible and inexpensive screen printed large area pressure sensing system is presented. The large area sensor comprise three layers, is able to cancel-out false pressure detection,...
This paper presents a new approach for monitoring the elbow flexion with a smart textile based on the piezo-resistive effect. The sensor is composed of a mix of conductive threads made of stainless steel fibers doped with metal particles and dielectric silk threads. The threads are arranged in a double bridle crochet structure to provide the best compromise between mechanical elasticity and sensor...
The online temperature measurement technology is analyzed and verified in this paper based on power supplied by the inductive current and wireless communication technique combined with the structure and principle of disconnector, solving problems in the online temperature measure system such as wireless data transmission, sensor operating supply and equipment high reliability in an environment of...
Nonintrusive monitoring is a powerful tool to increase the quality, reliability, and efficiency of power electronics systems. In recent years, the use of intelligent systems to perform this type of tasks has been increased due to its high capacity to correctly predict the values of the parameters under monitoring. Support Vector Machines (SVM) is a supervised learning method that maps input data into...
Modern systems of traditional and alternative energy, transport systems include powerful uninterruptible power supplies (UPS), implemented on batteries of charged electrochemical current sources — accumulators. These modules ensure the functioning of the systems in case of accidents or technological failures in the operation of main power supplies. The ability to provide the given energy modes by...
This paper presents new low frequency filters. The proposed filters are built around a floating active inductor (FAI), a capacitance multiplier and/or a resistance multiplier. The proposed FAI, capacitance (resistance) multipliers uses two current feedback operational amplifiers (CFOAs) and five passive components and can realize relatively large values of inductances, capacitances and resistances...
This paper proposes a method to estimate the stator winding temperature of permanent magnet synchronous motor (PMSM) driven by direct torque control (DTC) strategy, where the stator resistance is used as a direct indicator of the temperature. In this method, the quantitative relationship between the dc current offset and the corresponding changes in torque is derived. The dc current offset is generated...
There are of great importance to monitor the working condition of hydraulic equipment in industry. Some abnormal wear can be discovered from content and character of metal debris in lubricant. Detecting the debris can prognosticate failures in time and reduce losses. In this paper, the authors design a micro detecting system of lubricant debris based on LC resonance to improve the measuring accuracy...
This paper focus on the development of a new device suitable to detect and measure methane gas in areas of natural gas storage site. This device, the Smart Gas Detection system, can measure the air and water quality, including all the parameters that can have outliers by an eventual gas leak in the aquifer or atmosphere. The air quality parameters measured by low cost sensors, include CH4 and CO2...
Battery management systems can measure the performance of batteries. Most significantly, they can estimate expected run time under certain discharge conditions. The calculation is defined as the average current coming from the battery multiplied by the time it takes to reach a safe cutoff point of the battery. These two variables, average discharge current and duration, are directly proportional to...
DC ramped voltage testing is used to assess the condition of the stator windings in high voltage generator stator windings. When used to only assess the ability of an insulation system to withstand a predetermined DC voltage level, the continuous (and usually slow, typically in the order of 1 kV/min) increase in applied voltage combined with the continuous monitoring of the current often allows a...
This document discusses some common mistakes that are made in the commissioning of High Resistance Grounding (HRG) systems. While high resistance grounding has been in use for some time, many commissioning teams are less familiar with HRG systems and various issues can arise in the commissioning process. Topics discussed include: compatibility of equipment with HRG systems; how system configuration...
This paper aims to presents an overview of electrical contact resistance. The electrical contacts are important elements which can be found on all of the electrical installations from the power source to the consumer. The presence of an electrical contact on a current path always introduces an additional electrical resistance, named contact resistance. After an overview of the role of the contacts...
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